Metal complex nanoparticles and method for producing the same

Abstract

A method for producing metal complex nanoparticles, the method having: providing an aqueous solution containing a metal cyano complex anion having a metal atom M A as a central metal, with an aqueous solution containing zinc cation, the pH of the aqueous solution containing zinc cation being adjusted; and mixing the solutions and thereby producing metal complex nanoparticles composed of the metal atom M A and zinc under controlling the properties of the obtained metal complex nanoparticles.

1 . A method for producing metal complex nanoparticles, the method comprising:
 providing an aqueous solution containing a metal cyano complex anion having a metal atom M A  as a central metal, with an aqueous solution containing zinc cation, the pH of the aqueous solution containing zinc cation being adjusted; and   mixing the solutions and thereby producing metal complex nanoparticles composed of the metal atom M A  and zinc under controlling the properties of the obtained metal complex nanoparticles.   
     
     
         2 . The method for producing metal complex nanoparticles according to  claim 1 , wherein the particle size of the metal complex nanoparticles produced is minimized by adjusting the pH of the aqueous solution containing zinc cation to the range of 1 to 4. 
     
     
         3 . The method for producing metal complex nanoparticles according to  claim 1 , wherein the pH of the aqueous solution containing zinc cation is adjusted to the range of 1 to 6. 
     
     
         4 . The method for producing metal complex nanoparticles according to  claim 1 , wherein the metal atom M A  is one kind or two or more kinds of metal atoms selected from the group consisting of vanadium, chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, nickel, platinum, and copper. 
     
     
         5 . The method for producing metal complex nanoparticles according to  claim 1 , wherein after the metal complex nanoparticles are produced, the metal complex nanoparticles are treated with an aqueous solution containing a metal cyano complex anion which has the following metal atom M C  as a central metal, and/or with an aqueous solution containing a cation of the following metal atom M D , wherein Metal atom M C  is at least one metal atom, or two or more metal atoms, selected from the group consisting of vanadium, chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, nickel, platinum, and copper, and wherein Metal atom M n  is at least one metal atom, or two or more metal atoms, selected from the group consisting of vanadium, chromium, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, copper, silver, zinc, lanthanum, europium, gadolinium, lutetium, barium, strontium, and calcium. 
     
     
         6 . The method for producing metal complex nanoparticles according to  claim 1 , wherein the metal complex nanoparticles have an average particle size of 200 nm or less. 
     
     
         7 . Metal complex nanoparticles produced by the method according to  claims 1  to  6 , the metal complex nanoparticles comprising: a metal atom M A  and zinc formed in a Prussian blue-like crystal structure, the nanoparticles having an average particle size of 200 nm or less. 
     
     
         8 . The metal complex nanoparticles according to  claim 7 , wherein a metal cyano complex anion and/or a metal cation is adsorbed on the surface of the Prussian blue-like crystal composed of the metal atom M A  and zinc. 
     
     
         9 . The metal complex nanoparticles according to  claim 8 , wherein the Prussian blue-like crystal is formed in a core, and a shell formed by a combination of the anion and the cation adsorbed on the core is formed in which the shell has a Prussian blue type metal complex structure made of a metal composition different from the metal composition of the core.